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3M 5200
5200 and 4200 are the same thing. They are polyurethane adhesive/sealants. 4200 has less adhesive strength. They will both take gel-coat off if not removed properly, and even then it''s iffy. If bedded correctly, they are easier to deal with when and IF the item has to be re-bedded or removed.
There is also polysulfide, such as ''Life Caulk'' that is also very good. This is also an adheisive/sealant and will rip-up gel-coat as well. I don''t use polysulfide much anymore because it doesn''t clean-up with alcohol...5200 and 4200 does.
As for plastic hardware other than plastic ports, you can place the item where you want it and just use 5200 on the screws themselves or you can mount the item an a piece of teak or starboard only bedding the teak or starboard. In some cases, it''s not a bad idea to lift the item up a little anyway.
When I bed something, I don''t worry to much about removing it, I worry about it leaking.
Dennis
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